def greet_user():
    """显示简单的问候语"""
    print("Hello!")

#greet_user()



def greet_user(username):
    """显示简单的问候语"""
    print("Hello, " + username.title() + "!")

#greet_user('jesse')

def greet_user(username,age='0'):
    """显示简单的问候语"""
    print("Hello, " + username.title() + " age " + age + "!")

#greet_user(username='jesse',age='18')
#greet_user(username='jack')

def build_person(first_name,last_name):
    person = {'first':first_name,'last':last_name}
    return person

#musician = build_person('jimi','hendrix')
#print(musician)

#传递列表副本
#alphabet = ['a','b','c']
#print(alphabet[:])

def make_pizza(*toppings):
    for topping in toppings:
        print(topping)

#make_pizza('a','b')
